@article{GRACZYK2025107522,
title = {Optical excitation and detection of high-frequency Sezawa modes in Si/SiO2 system decorated with Ni80Fe20 nanodot arrays},
author = {P Graczyk and Bivas Rana and Aleksandra Trzaskowska and B K Mahato and Jarosław W. Kłos and Maciej Krawczyk and A Barman},
url = {https://www.sciencedirect.com/science/article/pii/S0041624X24002853},
doi = {https://doi.org/10.1016/j.ultras.2024.107522},
issn = {0041-624X},
year = {2024},
date = {2024-12-04},
journal = {Ultrasonics},
volume = {148},
pages = {107522},
abstract = {Surface acoustic waves have emerged as one of the potential candidates for the development of next-generation wave-based information and computing technologies. For practical devices, it is essential to develop the excitation techniques for different types of surface acoustic waves, especially at higher microwave frequencies, and to tailor their frequency versus wave vector characteristics. We show that this can be done by using ultrashort laser pulses incident on the surface of a multilayer decorated with a periodic array of metallic nanodots. Specifically, we study surface acoustic waves in the dielectric substrate Si/SiO2 decorated with a square lattice of thin Ni80Fe20 (Py) dots. Using a femtosecond laser-based optical pump–probe measurement, we detect a number of high-frequency phononic modes. By performing finite element simulations, we identify them as Sezawa modes from the second and third Brillouin zone in addition to the modes confined within the Py dots. The frequency of the Sezawa modes strongly depends on the period of the Py dots and varies in the range between 5 to 15 GHz. Both types of waves cover the same frequency range for Py dots with period less than 400 nm, providing a promising system for magnetoelastic studies.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{shekhar_effect_2024,
title = {Effect of the underlayer on the elastic parameters of the CoFeB/MgO heterostructures},
author = {Shashank Shekhar and Sławomir Mielcarek and Y Otani and Bivas Rana and Aleksandra Trzaskowska},
url = {https://www.nature.com/articles/s41598-024-71110-1},
doi = {10.1038/s41598-024-71110-1},
issn = {2045-2322},
year = {2024},
date = {2024-08-31},
urldate = {2024-09-12},
journal = {Scientific Reports},
volume = {14},
number = {1},
pages = {20259},
abstract = {We investigated the thermally induced surface acoustic waves in CoFeB/MgO heterostructures with different underlayer materials. Our results show a direct correlation between the density and elastic parameters of the underlayer materials and the surface phonon dispersion. Using finite element method-based simulations, we calculate the effective elastic parameters (such as elastic tensor, Young’s modulus, and Poisson’s ratio) for multilayers with different underlayer materials. The simulation results, either considering the elastic parameters of individual layers or considering the effective elastic parameters of whole stacks, exhibit good agreement with the experimental data. This study will help us deepen our understanding of phonon properties and their interactions with other quasiparticles or magnetic textures with the help of these estimated elastic properties.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Zdunek_2024,
title = {Investigation of phonons and magnons in [Ni80Fe20/Au/Co/Au]N multilayers},
author = {Miłosz Zdunek and Shashank Shekhar and Sławomir Mielcarek and Aleksandra Trzaskowska},
url = {https://dx.doi.org/10.1088/1361-648X/ad5486},
doi = {10.1088/1361-648X/ad5486},
year = {2024},
date = {2024-06-18},
journal = {Journal of Physics: Condensed Matter},
volume = {36},
number = {37},
pages = {375801},
publisher = {IOP Publishing},
abstract = {The interaction between phonons and magnons is a rapidly developing area of research, particularly in the field of acoustic spintronics. To discuss this interaction, it is necessary to observe two different waves (acoustic and spin waves) with the same frequency and wavelength. In the Ni80Fe20/Au/Co/Au system deposited on a silicon substrate, we observe the interaction between spin waves and surface acoustic waves using Brillouin light scattering spectroscopy. As a result, we can selectively control (activate or deactivate) the magnetoelastic interaction between the fundamental spin wave mode and surface acoustic waves. This is achieved by adjusting the magnetostrictive layer thickness in the multilayer. We demonstrate that by adjusting the number of layers in a multilayer structure, it is possible to precisely control the dispersion of surface acoustic waves while having minimal impact on the fundamental spin wave mode.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{JANARDHANAN2024171570,
title = {Spin wave dynamics in CoFeB bilayers with wedged Au spacer},
author = {Sreedevi Janardhanan and Sławomir Mielcarek and Hubert Głowiński and Daniel Kiphart and Piotr Kuświk and Aleksandra Trzaskowska},
url = {https://www.sciencedirect.com/science/article/pii/S0304885323012209},
doi = {https://doi.org/10.1016/j.jmmm.2023.171570},
issn = {0304-8853},
year = {2024},
date = {2024-01-01},
journal = {Journal of Magnetism and Magnetic Materials},
volume = {589},
pages = {171570},
abstract = {This paper presents the experimental studies of ferromagnetic layers separated by a heavy metal wedge. The studied system consists of two thin layers of CoFeB separated by a wedged Au spacer. By performing Brillouin light scattering measurements of the spin-wave dispersion relations, and dependences on the magnetic field, we extract magnetic parameters in the studied ferromagnetic layers as a function of heavy metal thickness. We concluded that for thin ferromagnetic double layers, the magnetic properties strongly depend on the thickness of the wedge gold layer spacer. In particular, the presence of perpendicular magnetic anisotropy diminishes as the thickness of the magnetic material is increased, and at the spacers thicker than 2.5 nm the dynamic coupling between propagating spin waves in both layers is negligible. These findings have potential advantages for the development of future spintronic devices.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Janardhanan2023b,
title = {Investigation of spin wave dynamics in Au/CoFeB/Au multilayers with perpendicular magnetic anisotropy},
author = {Sreedevi Janardhanan and Sławomir Mielcarek and Hubert G{ł}owi{ń}ski and Mateusz Kowacz and Piotr Ku{ś}wik and Maciej Krawczyk and Aleksandra Trzaskowska},
url = {https://doi.org/10.1038/s41598-023-49859-8},
doi = {10.1038/s41598-023-49859-8},
issn = {2045-2322},
year = {2023},
date = {2023-12-15},
journal = {Scientific Reports},
volume = {13},
number = {1},
pages = {22494},
abstract = {We have carried out an experimental investigation of the spin-wave dynamics in the Au/CoFeB/Au multilayer consisting of a ferromagnetic film with thicknesses of 0.8, 0.9 and 1.0 nm. We employed the Brillouin light scattering spectroscopy to measure the frequency of the spin waves in dependence on the wave vector. Additionally, we characterized the samples by ferromagnetic resonance measurements. We found that the considered samples exhibit perpendicular magnetic anisotropy with low damping, indicating small pumping effects. Furthermore, we found a nonreciprocal dispersion relation pointing at a non-negligible Dzyaloshinskii--Moriya interaction. These results make the Au/CoFeB/Au multilayer a compelling subject for further analysis and as a potential material for future applications within magnonics.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{JANARDHANAN2023171209,
title = {High-resolution Brillouin light scattering study on Ti/Au/Co/Ni multilayer},
author = {Sreedevi Janardhanan and Sławomir Mielcarek and Piotr Kuświk and Maciej Krawczyk and Aleksandra Trzaskowska},
url = {https://www.sciencedirect.com/science/article/pii/S0304885323008594},
doi = {https://doi.org/10.1016/j.jmmm.2023.171209},
issn = {0304-8853},
year = {2023},
date = {2023-09-01},
journal = {Journal of Magnetism and Magnetic Materials},
volume = {586},
pages = {171209},
abstract = {The topic of this paper addresses the Brillouin light scattering (BLS) study of the spin-wave and surface acoustic wave dynamics in the multilayer consisting of Ti/Au/Co/Ni deposited on Si substrate. We make the quantitative analysis of spin-wave frequency under a range of wave vectors to determine the dispersion relation and to study the effect of the magnetic field. These findings were correlated with theoretical models to determine the magnetic system parameters, such as magnetization, Lande g factor, exchange stiffness constant etc. In addition to this, we have conducted finite element method based simulations to understand the nature of surface phonons and to determine the elastic tensor parameters for the Ti/Au/Co/Ni layer from the fitting of simulation results with the experiment data points.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{shekhar_influence_2023,
title = {Influence of CoFeB layer thickness on elastic parameters in CoFeB/MgO heterostructures},
author = {Shashank Shekhar and Sławomir Mielcarek and Y Otani and Bivas Rana and Aleksandra Trzaskowska},
url = {https://www.nature.com/articles/s41598-023-37808-4},
doi = {10.1038/s41598-023-37808-4},
issn = {2045-2322},
year = {2023},
date = {2023-01-01},
urldate = {2023-07-04},
journal = {Scientific Reports},
volume = {13},
number = {1},
pages = {10668},
abstract = {The surface acoustic waves, i.e., surface phonons may have huge potential for future spintronic devices, if coupled to other waves (e.g., spin waves) or quasiparticles. In order to understand the coupling of acoustic phonons with the spin degree of freedom, especially in magnetic thin film-based heterostructures, one needs to investigate the properties of phonons in those heterostructures. This also allows us to determine the elastic properties of individual magnetic layers and the effective elastic parameters of the whole stacks. Here, we study frequency versus wavevector dispersion of thermally excited SAWs in CoFeB/MgO heterostructures with varying CoFeB thickness by employing Brillouin light spectroscopy. The experimental results are corroborated by finite element method-based simulations. From the best agreement of simulation results with the experiments, we find out the elastic tensor parameters for CoFeB layer. Additionally, we estimate the effective elastic parameters (elastic tensors, Young’s modulus, Poisson’s ratio) of the whole stacks for varying CoFeB thickness. Interestingly, the simulation results, either considering elastic parameters of individual layers or considering effective elastic parameters of whole stacks, show good agreement with the experimental results. These extracted elastic parameters will be very useful to understand the interaction of phonons with other quasiparticles.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{TrzaskowskaMechanical2022,
title = {Mechanical properties of the mouse femur after treatment with diclofenac and running exercises},
author = {Aleksandra Trzaskowska and Sławomir Mielcarek and Tomasz Lehmann and Ewa Pruszyńska-Oszmałek and Paweł Kołodziejski and Maciej Głowacki},
url = {https://www.actabio.pwr.wroc.pl/Vol24No2/33.pdf},
doi = {10.37190/abb-02061-2022-03},
year = {2022},
date = {2022-05-26},
journal = {Acta of Bioengineering and Biomechanics},
volume = {24},
number = {2},
pages = {null},
abstract = {The flexible properties of the bone are essential for the movement and protection of vital organs. The ability of a bone to
resist fractures under the influence of large muscles and physical activity depends on its established mechanical properties. This article
discusses how exercise such as treadmill running and taking non-steroidal anti-inflammatory drugs (NSAIDs), such as diclofenac, affect
the musculoskeletal system by modifying the elastic and thermal properties of the left femur of a mouse. Methods: The research was
conducted using 9-week-old C57BL/6J female mice. In order to investigate the elastic and thermal properties of bones, dynamic mechanical
analysis (DMA) and differential scanning calorimetry (DSC) were performed. Results: The study of elastic properties, followed
by in-depth statistical analysis, shows that taking diclofenac slightly reduces the elastic parameters of the bones under study. These
changes are more pronounced in DSC studies, the shift of the observed endothermic peaks is on the order of several degrees with a simultaneous
increase in the enthalpy of this process. Conclusions: The opposite effect of the applied factors – diclofenac and running – on
the elastic properties of the bones of the examined mice was found. The external factors – running and diclofenac – modify the basic
parameters of the endothermic process associated with the release of water.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{TRZASKOWSKA2022169049,
title = {The studies on phonons and magnons in [CoFeB/Au]N multilayers of different number of repetitions},
author = {Aleksandra Trzaskowska and P Graczyk and Nandan K. P. Babu and Miłosz Zdunek and H Głowiński and Jarosław W. Kłos and Sławomir Mielcarek},
url = {https://www.sciencedirect.com/science/article/pii/S0304885322000300},
doi = {https://doi.org/10.1016/j.jmmm.2022.169049},
issn = {0304-8853},
year = {2022},
date = {2022-01-13},
journal = {Journal of Magnetism and Magnetic Materials},
volume = {549},
pages = {169049},
abstract = {We investigated the interaction between spin waves and surface acoustic waves in the [CoFeB/Au]N multilayer deposited on the silicon substrate by Brillion light scattering spectroscopy. We showed that this kind of coupling manifested as an anticrossing in magnetoelastic dispersion relation, can be modified by changing the number of repetitions within the multilayer. The observed modification is attributed mostly to the change in the strength of dipolar interactions which alter the dispersion branch of spin wave fundamental mode and shifts the anticrossing towards larger wave vectors where the magnetoelastic coupling is stronger. The studied range of the wave vector was varied between 0.6·105 cm−1 and 2.2·105 cm−1 while the frequency range of investigations was between 3 and 20 GHz.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{TRZASKOWSKA2021106526,
title = {Dispersion of the surface phonons in semiconductor/topological insulator Si/Bi2Te3 heterostructure studied by high resolution Brillouin spectroscopy},
author = {Aleksandra Trzaskowska and Sławomir Mielcarek and M Wiesner and F Lombardi and Bogusław Mróz},
url = {https://www.sciencedirect.com/science/article/pii/S0041624X21001554},
doi = {https://doi.org/10.1016/j.ultras.2021.106526},
year = {2021},
date = {2021-07-21},
journal = {Ultrasonics},
volume = {117},
pages = {106526},
abstract = {The dynamics and dispersion of surface phonons in heterostructure semiconductor/ topological insulator Si/Bi2Te3 was investigated using high resolution Brillouin light scattering method in the GHz frequency range. Both Rayleigh and Sezawa surface acoustic waves have been observed for wave vectors ranging from 0.006 to 0.023 nm−1. Anomaly in dispersion relations ω(q) for both surface waves were detected for the wave vector q = 0.016 nm−1. The finite element method (FEM) was used to simulate the observed shapes of ω(q) and to find the deformation profiles of surface acoustic waves. We attribute the observed changes to the coupling between low energy electrons and surface phonons. The coupling between helical Dirac states and surface phonons is discussed in the frame of accessible theoretical models.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{000231402,
title = {Trabecular bone remodelling in the femur of C57BL/6J mice treated with diclofenac in combination with treadmill exercise},
author = {Tomasz Lehmann and Magdalena Wojtków and Ewa Pruszynska-Oszmałek and Paweł Kołodziejski and Celina Pezowicz and Aleksandra Trzaskowska and Sławomir Mielcarek and Mirosław Szybowicz and Ariadna B Nowicka and Marek Nowicki and Ewa Misterska and Ewa Iwańczyk-Skalska and Paweł Jagodziński and Maciej Głowacki},
url = {http://www.actabio.pwr.wroc.pl/Vol23No3/41.pdf},
year = {2021},
date = {2021-05-13},
journal = {Acta of Bioengineering and Biomechanics},
volume = {23},
number = {3},
pages = {1 -17},
abstract = {Analgesic treatment with diclofenac deteriorates bone structure and decreases biomechanical properties. This bone
loss has been though to be reversed by training. The impact of exercise on bone treated with diclofenac (DF) has reminded elusive.
In the present study, we assayed the combined impact of exercises and DF on mouse femur. Methods: The femur samples we
obtained from 30 days treated C57BL/6J female mice. The training group ran on a horizontal treadmill at 12 m/min by 30 min
a day (5% grade/slope). The group of ten mice treated with DF received the drug subcutaneously every day (5 mg/kg of body
weight/day). The combined group ran on the treadmill and obtained DF. After 30 days, we sacrificed mice and studied their femurs
using microcomputed tomography (μCT), dynamic mechanical analysis (DMA) and nanoindentation. Results: We observed
that treadmill running and DF decreased trabecular bone volume and mineral density. Combined effect of training and DF was not
additive. A significant interaction of both parameters suggested protective effect of training on bone loss provoked by DF. The femur
cortical bone shell remained untouched by the training and treatment. The training and the DF treatment did not alter the storage
modulus E significantly. The unchanged storage modulus would be suggesting on the unaltered bone strength. Conclusions:
We concluded that even relatively short time of training with concomitant DF treatment could be protective on trabecular bone.
Although viscoelastic properties of the entire femur were not modulated, femur trabecular tissue was thinned by treatment with
DF and protected by training.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{doi:10.1021/acs.nanolett.0c03692,
title = {The Interaction between Surface Acoustic Waves and Spin Waves: The Role of Anisotropy and Spatial Profiles of the Modes},
author = {Nandan K. P. Babu and Aleksandra Trzaskowska and Piotr Graczyk and Grzegorz Centała and Szymon Mieszczak and Hubert Głowiński and Miłosz Zdunek and Sławomir Mielcarek and Jarosław W. Kłos},
url = {https://doi.org/10.1021/acs.nanolett.0c03692},
doi = {10.1021/acs.nanolett.0c03692},
year = {2021},
date = {2021-01-01},
journal = {Nano Lett.},
volume = {21},
number = {2},
pages = {946-951},
abstract = {The interaction between different types of wave excitation in hybrid systems is usually anisotropic. Magnetoelastic coupling between surface acoustic waves and spin waves strongly depends on the direction of the external magnetic field. However, in the present study we observe that even if the orientation of the field is supportive for the coupling, the magnetoelastic interaction can be significantly reduced for surface acoustic waves with a particular profile in the direction normal to the surface at distances much smaller than the wavelength. We use Brillouin light scattering for the investigation of thermally excited phonons and magnons in a magnetostrictive CoFeB/Au multilayer deposited on a Si substrate. The experimental data are interpreted on the basis of a linearized model of interaction between surface acoustic waves and spin waves.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}